Question # 1

The part of the universe that we want to focus our attention called.

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Surrounding

Energy

System

Both a and b

In the formation of AlF₃, aluminum atom loses........electrons.

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1

4

3

2

Formation of NO is

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Exothrmic

Endothermic

No Heat Change

None of these

When acids react with metal with carbonates and bicarbonates which gas is produced.

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N2

H2

Cl2

CO2

At what temperature , rate of ammonia formation and decomposition is the highest.

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200 ^oC

300^oC

400 ^oC

500 ^oC

Transfer of electron between elements result in.

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Coordinate covalent bonding

Ionic bonding

Metallic bonding

Covallent bonding

The branch of science helps to understand chemcial product andprocess that reduce the use of hazadous substances.

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Green chemistry

Astrochemistry

Analytical chemistry

Physical Chemistry

With the increase of atomic numebr , the number of electron in an atom also.

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Decreases

First increases then decreases

Increases

None of the above

Which branch of chemistry helps to protectwater that bas been poisoned by soil.

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Organic chemistry

inorganic chemistry

Environmenal chemistry

Geochemistry

How many electrons can nitrogen accept in its outermost shell.

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2

3

4

5

The electropositive elements have the tendency to

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Lose electrons

Gain electrons

Share electrons

All of these

Which liquid among the followingis a colloidal solution.

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Milk

Slaked lime used for white wash

Vinegar solution

Mixtur eof AgCl in water

Why has isotopes not been shown int he periodic table.

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Isotopes do not show periodic behavior

Periodic tble cannot accomodate a large number of isotopes of different elements

All the isotops have same atomic number so there is no need to give them separate places

Someof the isotopes are unstble and they give rise to different elements.

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